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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282d1b7d8c99276222dff6eb9a8baaf8052b620542d512286bf09527b82871c6' 
  AND token = 'i4qfi+EaKUPhN8yu1vonnwP35XwpsU5aXeNUu7I5i4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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