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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b835e1155826aac2088e8eae3ba9b6131c1dd30fcfb9e59c3a9ca08e2132eb3e' 
  AND token = 'bN7GvgbcBzc6BoY13MVscR2AXfOtmvTlRQyL8o9jpg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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