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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a0502af7f67a67683c8777cc59d8b3ad3cd2f15f84808561b134988f4a73b5' 
  AND token = 'nhV7l1wE55i3V1rmNRdZIBVn+hoGQP1mlrWiWxt8LzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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