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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c545e84a5142210f3e5837f3144622785c3c03d79375b30c0f9f2fa1f63e10ac' 
  AND token = '2G9LiAztiBlXActtrfaJaiKaYwqNTHmQh/QFoFrhI5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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