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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7300b0597d48b158e33d70abbe22f903015cc681260a5a7aa3c3b6de4020b2da' 
  AND token = 'kBKFd0SVThGxr4dY1/aSew72W2REgj+Y7NHX6L+sBJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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