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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db24dbb0c33f0ee47687e274780ce3862767f1da5e6c28bf1d13c754a443065' 
  AND token = 'sERML8lfuxYOPuDSPADqDHxeHtB22kX89dmH5cTB2xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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