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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5825a783195621daaef3205f6ea05a8dd9b941224ccd7d59b5507de61d86f8e' 
  AND token = 'nS1fnwrxqrrOgqKcejzEOouS4QXYfzFTGojsi6wFLYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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