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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1910fae5f3cad180e9545dc7396aef7166d16c967910d55b0449cc3e23ebd10f' 
  AND token = 'RJzTAsqHUrZHtECAv+rul0tekZ5n7Lh4rqagqDLeWGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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