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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b15c01ae7819088d3a272d9531ff260b5b0c848b4d877ab6e568fac44760448' 
  AND token = 'EyobRx+3vVl8S28182j8ll5+Tlj6izzI1wEtPcr7YLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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