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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cd53171be562b22a193e8ae4352aeaac25912e1c88e6e0ae34cd2e7e7ad169' 
  AND token = 'LM42Og2HTSxH5aFsCun5iKQQKNPFZSfcjVZbCCPixTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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