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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9ec5a1b4ae88a9fdf0c97fa542f0a4476eb3c7f490799788370b530307e354' 
  AND token = 'mfEdrqLbt9v0ReTod/cSt3AEvNpglwX61Zw2albZhLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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