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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4993fb80d376ae82ab074e63f4b75b2cca5dba26742a79c793780f9eef2659da' 
  AND token = 'BE/pv216gHTCDqmIX2y5ZWsf+aGByM4McHBOQjHg7iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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