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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d19802aec1db4ed87729bdaab31383a0ff6261db7edce905e399466db18f61b' 
  AND token = 'MEOzKkcduJtMS/RlsDlrNhLgBxaeqs1Ng2XjFSTsOF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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