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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dcd6b4239f14df19d7393bc19212098565b133d463766a8114b200ac6c5096' 
  AND token = 'Xwu+KQr7rV5KM85l1imFrlKjm8lfJODWd01o0Qo/jcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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