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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35986e91dea2f83ba2f6a86fe5768186a53f260d22ea7d9436ac7ae59453e8cc' 
  AND token = 'oUFkZkg56X+bhCOe4DUpjLDj1BqXGlBveXcHi7etulA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}