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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6b96f15b097076379537308d08ba9725a2c33351a0b318edd7d6d695b49cf1' 
  AND token = 'mDsqM3ONa9Qf6YcEByhHHGTtNek+kj9ceC9KhM/S0to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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