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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4343c920184e55d6c64c7deab9dd156d4767c33beae84051b105fca13e99d313' 
  AND token = 'XazCtfQt1rxwfZ8ZFoFeNtTxzGsDry5nHiWVlc6/ICo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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