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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5e502b0f3a0bd44a787879a3142e4dc9ac49303a464a6b4116d1583ae6a98e' 
  AND token = 'XDQBe55ZkPJ82EcP57APDeoUBWGsaIUAm8EnBqZjGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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