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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71e4b13fb33be390bf4413b6de1ad847a67d9a58490c606e801810a871585eb' 
  AND token = '8Up6URNrdkqgkEqoVFfMtcp6ac9x+QJ6bCvVQeVkazE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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