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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0927fa5de4616ba5165867a89512c0a93f0cfe6f491602fd7790997bb6ae3b' 
  AND token = '5UYaLNrTEuNnuSw+1TU7LTTt0HuWXilBl8MtiwTsl4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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