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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5847b34eb330571922731a5fb68742be8a1cc5b19a0f76bb7e166d3c3cc0ba03' 
  AND token = 'hsgwk3+GPpB/gFUNmRUDJTWAi3NOzmwf1DW9EHtpT30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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