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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0248e6f5bd414bfda1e2a7d4707a382ae01dc1668840fe362db18d8659520666' 
  AND token = 'D2ci0yh4+gXzXLywuuiJPN+F+C6O3CaWLye2smglz34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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