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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094c4a4867a0fe72fde17e04603dcf15e3838963b4325350a2b3df59bdc1ee11' 
  AND token = 'NeR5e6PV+KRE309R+ex5ID307bsVn0EEPpGRmp+Vrsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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