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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40f24c7326bf5ba5864b4efd7e8a543a20e51bbb4a5be4bf8bf919782f7574a' 
  AND token = '1V65LihkU+2j+R3BuYPleEqpSwy733a7s4mxj0qqbog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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