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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b24bf3f5588a4790c9de819071cd5c93ead40c2156e38c0d62f416250e52c4b' 
  AND token = 'jjrqV08qrLhw27cxTb/29e+6C2bfR9EisU8fJq3SwNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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