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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a126e992c4eee73c854838fd2eafc29c048265584bff946c9bd4e8fad99a43b8' 
  AND token = 'ygafvVy5qFAo3T6fwcj1cSLxl7RE9LJ7gH+c1VcyCLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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