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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae29d812e41e39127f39b723aaf5a88ffe61723587263bb32140de93e160edc' 
  AND token = 'sytK5AKKS8m2nIMlJ50ki1iAU8zR3TqUT5Ezi1S0NCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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