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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43be1109f7219b6b8fd504dd9cda5f567e961d4a33597b5bfd5708866fe29cd8' 
  AND token = 'NmTkN5snleRGDVKOW02tMJydrhSiVFaFTsfwYOYgn0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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