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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b7b8e2a2413dc50bd5ac7e0b3cfa9c752589cf7bc906a129a0996b55fb9117' 
  AND token = 'OEKX4tqSKl5AnuRa4wqCL/NhkhldaNIWamge8dNDLVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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