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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba1b91bd802b75414dcc393e74d597587723cd8ce5ef3ada405ab53b3db15e9' 
  AND token = 'X8RYG4HNzmk+AF5krLSMWEaft3Rz4UbwuAtHuviUK0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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