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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8956b642d4b359db03ef223b7ad1570f31b30d848a2b99ec538c08030f9a58' 
  AND token = 'U+6cB4m4Lj3oe9QoyOfjHNYs3AK9CFnQy/n5GqHmFts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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