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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ac1d50502604eca449c4f84b0910257ced48961771a6b7bc38a0922f68e17a' 
  AND token = 'vBWIY1sBvEAtFJ37N8RZDgMJcq3yUEpOJ6vZc1b5yWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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