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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a521b059fae5de0b165f70feafc7a88036c51413614dce66f9bc26aeaf7242' 
  AND token = 'w7u55mUiRZ/fE49Koveup6ron9kB8EKrKiLlhVSoIqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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