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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef6c23db4867112e438ca9f7b8c07d06d3858daaeba486f6d6f90f37f4675d2' 
  AND token = 'GTL4r6oIc537OUYWrpwiMfFgOO0sqZJhxre7rXNaNk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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