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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d3f3ea8dc3fa3a8d293a55264ab2ef6a0fd951fdcf50c0b0cded24dc61a3b0' 
  AND token = 'cmYVi4GW9ceClqe15q6/CBv1/p9bcBzfqIq3/ZiXY1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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