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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be60c2a5428a5f5602f64fae605136d9340379b29f4d0bccf5f8ab83046cde60' 
  AND token = 'wUojZAIgdAt3hdwme283b+duFT8yOtEXSYIHwurk2p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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