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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f69a1ebb566210634758266c7d20accd4dcf83467d776bec657ef4f1a7cca9' 
  AND token = 'np84xf/Cs7T44JOiJwc9eT6xIkhufWT9EwlTYqrvE1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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