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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d61ea0040b3d6ea1e13c494dc28d3c0875b3ab24a59c257570ce07ca288cf1b' 
  AND token = 'TnfqiRIIzKx51B/cIZve8w13KJ49fOUOEKA9RV+cEGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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