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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45dee4990cb9f2310621060d59ee7b2f07928807d9b264f042e86d1ebe4ff4a' 
  AND token = 'KoiSBwW+Qyj3QQjRJEswWTKD7drY13byTNTEykGi4hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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