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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884b3a0451af772407e41c0e282dfd9292c0f6243dbb31139e71a5100615bce7' 
  AND token = 'NL7IUFAYqUfB1Y+WA2NM8RFvFsJ4j1d4cMpalBu2aIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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