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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3effa7dfc8566e61654419ee2def0579dfda1d91b907c8607926ac9dc6b00ce' 
  AND token = 'XdpfnWriAnC7mbZFyQl60MouGP8E8wPmFdrMJExIW54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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