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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5805d8945cc4d5dc31ed7d54f14386227c415e3a395ae8ebd27eb19680f445' 
  AND token = '6NfAAkourwdF0099vt9HMESzwX/Z4nNdNVtHpIVgZQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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