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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4bb101053e164112900e03194d0073ed66d769e02a48907db56b49cbd5c640' 
  AND token = '7MqdUJvna9O7b1bWYfgKZs44/q5dwpv8cWKIWfz3aH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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