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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ef94750e8db3a7b139874c2062fc1dd9ae9583acfbe42bbaaa65bb9d1a4edd' 
  AND token = '5KoDEowDTomLQ1gr1pMhxaY9NL4gkII5qR/n0QhDObk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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