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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704d48bb948b1d50ee0476e1a51e370666d2091762f4c1fa2a9fc376e505d53b' 
  AND token = 'V4VtLYuqICU0cBMIL1IPhFagXogR1n0KtBumjyBtobU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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