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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca01ac2d4fd8157f839f6d9d5abf5f48beafe040ceedc25ac9c76876599c42b' 
  AND token = 'snrD+W3jK6hu9242Yeve5gN10WlLDlEOXMCPQ7Jnnsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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