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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb0e7aa20c94c70d5b897d1bef9d0fb282443f9b1d1763a54a9e7f57aec93bf' 
  AND token = 'aEQOlymHTJTVWy9KnDRiEjET+kolyr/RgsGBetJppZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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