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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fcd8a63573a54dc1bb7b8400f6d88454323619ece8e3bd514217385c325a9b' 
  AND token = 'UBVSh7wVJFWDrsOUlofCBpmzIoUd35ecc8hufFbPvH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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