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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774c6388c0011047195400ea2df04f3802027da786695447cb3bc89a22311f3b' 
  AND token = '3GttmeWiDvNgeon2NF96sY0F2zylznIf+y6ETyNXYPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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