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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea081866226ee2149337e43caaeb7e294f6d9491687e45e7bb37fb65958c0199' 
  AND token = 'MNIUrRNtQ8TR7JIgxxUsl843W6xBodsL/F9CjovorEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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