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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b838e60e659612c8b335659443cc9c67dcae11c87f40c45df731e727f22babc1' 
  AND token = '9VePwQAVlL7i32vQ4R3tEVBORyGZSva6oWmu8KRIGwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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